Drier for sheet materials



June l9, 1928. 1,674,349

A. J. VANCE DRIER FOR SHEET MATERIALS Original Filed Aug 1, 1924 INVENTOR.

. AZJVan ATTORNEY??- Patented Jnne l9 1928. L.

- reuse UNITED STATES PATENT OFFICE. v

ARTHUR J. VANCE, OF PAINESVILLE, OHIO.

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Original application filed August 1, 1924, Serial No. 729,617. Divided and this-application filed ,I'annary 15, 1925. Serial No 2,593.

This invention relates to driers for veneers and the like wherein the material under treatment is conveyed throughthe drier by means of a series of pairs of conveyor rolls, the air in the drier being suitablyheated and, in treating some materials, having steam mixed therewith and the application" is a division of my copending application for patent on drier for sheet material filed August 1, 1924, Serial Number 729,617.

Metal rolls are frequently used for these conveyor rolls but certain materials are apt to be damaged by direct contact with such metal rolls and it has been proposed to use felt covered rolls for such cases. Such rolls,

especially in cases in which the material itself is quite moist or in which steam is used; tend quickly to mat down and become hard and thus become inefiective in operation. r

. The principal object of the present invention is to provide an improved arrangement of such rolls in connection with a heating.

device wherein the elements are so disposed that the rolls will lie in juxtaposition to the heating device and are subjected throughout their lengths to heattherefrom, thus being kept suiiiciently hot to evaporate any moisture as quickly as it is absorbed. The felt has a great capacity'for absorbing moisture and rapidly extracts the moisture from the material at the points of contact as the rolls revolve, the felt then giving up its moisture' to the currents of warm air rising from the steam coils. This action ensures the rapid drying of materials that are saturated with moisture, such as plaster board and the like,

and ensures the more rapid drying of materials that must be dried in comparatively low temperatures.

One arrangement for accomplishing this object will now be specifically described, par-- ticularly pointed out in the appended claims and illustrated in the drawings forming part of this specification wherein:

Figure 1 is a side elevation of a portion of the interior conveyor and heater structure 1 of a drier embodying this invention. Figure 2 is an enlarged cross section partly broken away, the section being taken on the line 22 of Figure 1.

' Figure 3 is a section on the 'line 3-3 of Figure-2.

Any suitable form of construction may be used to support the conveyor rolls.- For instance, a conveyor frame may be constructed having vertical members connected by angle irons 11 whereon are supported the return bends 12 of a continuous heater pipe 13 extending back and forth from one angle iron to the other.

vAlso, between the vertical members 10, ex- I tend the bearer bars 14 which support the conveyor rolls. These bars have each a lower series of openings 15 and an upper series of slots 16, each slot being disposed directly above a respective openlng. In the lower engagement by a drive chain (not shown).

Each of the rolls has a tubular body por tion 22 and is covered by a tubular felt casing 23- and it will be noted that the respective pairs of rolls lie vertically above the openings are received the journals 17 of the L '18 by gears 20. On the other side each w journal 17 is equipped with a sprocket 21 for v space between two' adjacent lengths of the Y heater pipes and that these pipes are very close to the lower rolls. Thus the convection currents rising from these pipes sweep over the rolls and heat them to such an extent that any moisture taken up by the felt coverings during operation is almost instantly caused to evaporate therefrom and accordingly the coverings are maintained in practically dry condition and do not met nor become hard and slippery.

Changes in the particular manner of supporting the rolls and heater and other changes will readily suggest themselves to those skilled 'in the art, such changesbeing entirely within the scope of the inventiom Accordingly, it is not desired to confine the invention to the exact form shown and described but rather it. is desired to include all such as properly come within the scope claimed.

Having thus described the invention, what 7 is claimed as new, is: r a

' A drier of the type described, comprising a drying chamber, pairs of conveyor rolls alined longitudinally of the drier, so that the materialv to be' dried may ass between the rolls of each pair, said re s being provided with an absorbent covering to thereby extract moisture from material passing therethrough and the rolls of each pair being subthereon and cause convection currents of air stantially in vertical alinement; means for to pass up over therolls to thereby continudriving said rolls, and individual moistureously condition the'rolls for absorption by 10 expelling means for each pair of rolls c0mcausing rapid evaporation of the extracted 5 prlsing heating means positioned below and moisture. i

. closely adjacent-to each pair of said mois- In testimony whereof I aflix my signature.

tare-extracting rolls to concentrate heat ARTHUR J. VANCE. 

